COSTS and BENEFITS of GB INTERCONNECTION a Pöyry Report to the National Infrastructure Commission

COSTS AND BENEFITS OF GB INTERCONNECTION February 2016 Commission A Pöyryreportto the National Infrastructure INTERCONNECTION COSTS ANDBENEFITSOFGB COSTS AND BENEFITS OF GB INTERCONNECTION Contact details Name Email Telephone Benedikt Unger [email protected] +44 20 7932 8249 Stuart Murray [email protected] +44 20 7932 8244 Pöyry is an international consulting and engineering company. We serve clients globally across the energy and industrial sectors and locally in our core markets. We deliver strategic advisory and engineering services, underpinned by strong project implementation capability and expertise. Our focus sectors are power generation, transmission & distribution, forest industry, chemicals & biorefining, mining & metals, transportation, water and real estate sectors. Pöyry has an extensive local office network employing about 6,000 experts. Pöyry's net sales in 2014 were EUR 571 million and the company's shares are quoted on NASDAQ OMX Helsinki (Pöyry PLC: POY1V). Pöyry Management Consulting provides leading-edge consulting and advisory services covering the whole value chain in energy, forest and other process industries. Our energy practice is the leading provider of strategic, commercial, regulatory and policy advice to Europe's energy markets. Our energy team of 200 specialists offer unparalleled expertise in the rapidly changing energy sector. Copyright © 2016 Pöyry Management Consulting (UK) Ltd All rights reserved No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, mechanical, photocopying, recording or otherwise without the prior written permission of Pöyry Management Consulting (UK) Ltd (“Pöyry”). This report is provided to the legal entity identified on the front cover for its internal use only. This report may not be provided, in whole or in part, to any other party without the prior written permission of an authorised representative of Pöyry. In such circumstances additional fees may be applicable and the other party may be required to enter into either a Release and Non-Reliance Agreement or a Reliance Agreement with Pöyry. Important This document contains confidential and commercially sensitive information. Should any requests for disclosure of information contained in this document be received (whether pursuant to; the Freedom of Information Act 2000, the Freedom of Information Act 2003 (Ireland), the Freedom of Information Act 2000 (Northern Ireland), or otherwise), we request that we be notified in writing of the details of such request and that we be consulted and our comments taken into account before any action is taken. Disclaimer While Pöyry considers that the information and opinions given in this work are sound, all parties must rely upon their own skill and judgement when making use of it. Pöyry does not make any representation or warranty, expressed or implied, as to the accuracy or completeness of the information contained in this report and assumes no responsibility for the accuracy or completeness of such information. Pöyry will not assume any liability to anyone for any loss or damage arising out of the provision of this report. PÖYRY MANAGEMENT CONSULTING February 2016 080_Poyry_CostsAndBenefitsOfGBInterconnection_v500.docx COSTS AND BENEFITS OF GB INTERCONNECTION EXECUTIVE SUMMARY Introduction and approach Over the last few years, commercial interest in GB interconnection projects has noticeably increased with ~10GW of new interconnection capacity proposed by 2025. The growing project pipeline can be seen as a natural commercial response to the changing market and regulatory environment. However, the impact on the operation of the GB energy system of such a fundamental shift in interconnector capacity is still uncertain, as is the ability to realise projected benefits for the developers, consumers and the wider economy as interconnection capacity with particular countries or regions grows. As part of the National Infrastructure Commission’s (NIC’s) investigation into key national infrastructure challenges, the NIC has asked Pöyry to review the costs and benefits of interconnection, drawing on the existing evidence base. The aim of this report is to highlight to what degree the conclusions from pre-existing work are robust to the high degree of uncertainty about the future of European electricity markets. Pöyry has drawn upon a range of reports, studies and other publications to form the evidence base for this report. These documents have been reviewed to compile common conclusions on the socio-economic welfare impacts and wider societal costs and benefits of interconnectors serving GB. Benefits of interconnectors There is strong agreement that the socio-economic welfare value of interconnectors comes from their ability to improve the efficiency of outcomes in the electricity system, lowering the cost of meeting demand and of achieving other policy objectives such as improving security of supply and enabling more efficient renewables integration. The overwhelming majority of literature reviewed concluded that additional interconnection beyond current levels is likely to bring significant benefits to the UK. However, whether particular interconnector combinations provide a net benefit to GB and the wider system depends on several aspects: the boundary conditions, i.e. which stakeholders are included in the analysis, in which countries and what categories of costs and benefits are included; the objective function, e.g. welfare maximisation, cost minimisation, carbon minimisation; and the specific market modelling assumptions, e.g. commodity prices, capacity build and future energy policy assumptions. Therefore comparability between conclusions of studies is hard as while they often look at the same impacts they do it through a different lens. It is important to acknowledge that the majority of studies look at societal benefit, not the incentives on a commercial developer. Sources of socio-economic welfare value The socio-economic welfare value of interconnectors comes principally from balancing the capital and operational costs of new connections with cost and efficiency improvements represented by hourly wholesale price differences between markets. Such wholesale price variations between markets provide the key market signals for PÖYRY MANAGEMENT CONSULTING February 2016 080_Poyry_CostsAndBenefitsOfGBInterconnection_v500.docx COSTS AND BENEFITS OF GB INTERCONNECTION interconnection and by exploiting these differences interconnectors affect the socio- economic welfare of the system. This wholesale price value can be helpfully differentiated into three main types: wholesale price level value, where prices differ on an annual average basis i.e. largely intrinsic value as can be traded ahead of time, with future value driven by commodity prices; wholesale price shape value, where prices differ in their underlying average shape over a period in a way that can be predicted i.e. a mix of intrinsic (i.e. average price differential) and extrinsic value (i.e. hourly price differentials, tradable only very close to real-time due to forward market granularity issues), robust over relatively long-time periods; and wholesale price volatility value, deriving from unpredictable price peaks and troughs which only appear close to real-time i.e. largely extrinsic value, dependent chiefly on difficult to forecast events and the roll-out of intermittent generation. In addition, value for certain interconnectors can come from their ability to provide services to System Operators (i.e. balancing and ancillary services) and provide capacity contribution in one or both markets they connect, represented in GB (and some other European markets) by payments under a capacity market. The importance of each value source will vary between markets and will also change over time (depending on renewables and storage deployment, electrification of heat and transport, smart grid development, etc.). There are likely to be more persistent arbitrage opportunities with some markets than others (e.g. Norwegian interconnector arbitrage opportunities are high in most scenarios presented in the studies reviewed). The review suggests a general agreement that the importance of extrinsic value is likely to increase in the future. Security of supply Interconnectors can potentially increase the security of supply in one or more electricity systems. However, additional interconnector capacity could displace domestic sources of generation. The net of these effects is uncertain and the impact on both systems will be dependent on the detailed assumptions of a study. Some of the criticism of interconnectors has been directed at the lack of economic rationality in flows. While this has been an issue in the past, it is less prevalent now with improved market coupling at the day-ahead stage and the structures being introduced under the target model. The extent to which interconnectors displace capacity in GB depends on how they are treated in the capacity market, especially with regard to de-rating factors and the assessment of required capacity that is procured through the auctions. If de-rating factors are applied appropriately, interconnectors should not be inferior to generation capacity in the capacity mechanism. However, given that these de-rating factors are based on projected price differentials, some uncertainty and risk remains as these projections could be incorrect. This risk is mitigated by: using conservative de-rating factors;

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